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See detailExperimental study and modelling of cooling ceiling systems using steady-state analysis.
Fonseca, N.; Lebrun, J.; Andre, Philippe ULg

in International Journal of Refrigeration (2010), 33

Detailed reference viewed: 52 (15 ULg)
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See detailExperimental Study and Statistical Modeling of an Injection Scroll Compressor Operating with R407c.
Quoilin, Sylvain ULg

E-print/Working paper (2014)

This working paper describes an experimental study carried out on a refrigeration scroll compressor with and without vapour injection. The test rig designed for that purposed allows evaluating the ... [more ▼]

This working paper describes an experimental study carried out on a refrigeration scroll compressor with and without vapour injection. The test rig designed for that purposed allows evaluating the performance over a wide range of operating conditions, by varying the supply pressure, the injection pressure, the exhaust pressure, the supply superheating and the injection superheating. 97 Steady-state points are measured, with a maximum isentropic efficiency of 64.1% and a maximum consumed electrical power of 13.1 kW. A critical analysis of the experimental results is then carried out to evaluate the quality of the data using a machine learning method. This method based on Gaussian Processes regression, is used to build a statistical operating map of the compressor as a function of the different inputs. This statistical operating map can then be compared to the experimental data points to evaluate their accuracy. [less ▲]

Detailed reference viewed: 139 (15 ULg)
Peer Reviewed
See detailExperimental study of a heat exchanger for an in-flight oxygen collection launcher
Hendrick, Patrick; Bizzarri, Didier; Dardenne, Laurent et al

in 14th AIAA/AHI International Space Planes and Hypersonic Systems and Technologies Conference (2006, November)

In the scope of an ESA-funded theoretical and experimental study (in the GSTP3 program) on heat exchangers intended to provide in-flight oxygen collection capability to a reusable or a semi-reusable TSTO ... [more ▼]

In the scope of an ESA-funded theoretical and experimental study (in the GSTP3 program) on heat exchangers intended to provide in-flight oxygen collection capability to a reusable or a semi-reusable TSTO launcher with an oxygen collection phase in supersonic cruise, two subscale models of an air-hydrogen precooler and a test set-up are currently being developed in Belgium and in Spain. The vehicle we foresee for this application is described in previous conference papers as well as the work on our ESA-funded airborne air separator, which is the other critical element of the oxygen collection plant. This current paper is concentrating only on the theoretical but mainly the technological and experimental aspects of such an air precooler. The experimental and technical aspects include choices and main trade-offs that have had to be made during the design process by the different partners (Techspace Aero, von Karman Institute, Iberespacio, University of Liège, Royal Military Academy of Belgium and University of Brussels). After we fixed the requirements at system level and at the precooler level, a simulation work of generic heat exchangers is presented including the problem of frost formation and its influence on the heat exchanger performance. A few advanced heat exchanger designs are analysed resulting in a more detailed parametric and performance analysis of two advanced configurations. A detailed study of the most advantageous heat exchangers materials is shown resulting in the selection of the alloys for the two breadboards. The manufacturing processes for these two breadboards are defined, based on trials on small scale models inspired from the two technology candidates. Perspectives are also given for the mechanical and thermodynamic testing of the two breadboards. [less ▲]

Detailed reference viewed: 59 (1 ULg)
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See detailExperimental study of a randomly agitated 2D granular pile
Lumay, Geoffroy ULg

Conference (2006, June 09)

Detailed reference viewed: 5 (1 ULg)
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See detailExperimental study of a river biofilm growth on artificial cobbles in contrasted flow conditions
Moulin, F.; Peltier, Yann ULg; Pen, C. et al

in International Workshop on Environmental Hydraulics (2009)

Detailed reference viewed: 12 (4 ULg)
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See detailExperimental study of a vertical column of grains submitted to a series of impulses
Lumay, Geoffroy ULg; Dorbolo, Stéphane ULg; Gerasimov, Oleg et al

in European Physical Journal E -- Soft Matter (2013), 36

Detailed reference viewed: 41 (14 ULg)
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See detailExperimental study of air-hydrogen heat exchangers
Hendrick, Patrick; Heintz, N.; Bizzarri, Didier et al

in The 15th AIAA International Space Planes and Hypersonic Systems and Technologies Conference . April 28- May 1 2008 (2008, April)

Detailed reference viewed: 21 (1 ULg)
Peer Reviewed
See detailExperimental Study Of An In-Flight Air Separation Device
Bizzarri, Didier; Hendrick, Patrick; Heyen, Georges ULg et al

in AIAA/CIRA 13th International Space Planes and Hypersonics Systems and Technologies Conference (2005, May)

Intending to provide in-flight Oxygen Collection capability to new launchers, a subscale model of a centrifugally enhanced air distillation unit is under development. The vehicle we foresee for this ... [more ▼]

Intending to provide in-flight Oxygen Collection capability to new launchers, a subscale model of a centrifugally enhanced air distillation unit is under development. The vehicle we foresee for this application is described elsewhere, the present paper concentrating only on the technological and experimental aspects. While the test setup has already been shown to be able to provide the adequate cooling power, the rig is still under construction. The experimental and technical aspects include choices and main trade-offs that had to be made during the design process. Of particular interest are the stainless steel all welded heat exchangers allowing for deep cooling and liquefaction of air from the main compressor and dryers. Specifically, developed hardware is described in details. On the test rig side, design of the rotating cryogenic separator is explained, including mechanical aspects, heat management and sealing. The whole system has modes of operation allowing, among other parameters, to explore various air compositions and mass flows rates on the gaseous and liquid sides. Perspectives are given for the testing of the separator. [less ▲]

Detailed reference viewed: 134 (3 ULg)
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See detailExperimental study of ball and roller bearings
Hanocq, Charles ULg

in Proceedings of the general discussion on lubrication & lubricants : 13th-15th October 1937. Volume 2 (1937)

Detailed reference viewed: 7 (0 ULg)
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See detailExperimental study of cracking induced by desiccation in 1-dimensional systems
Lecocq, N.; Vandewalle, Nicolas ULg

in European Physical Journal E -- Soft Matter (2002), 8(4), 445-452

We designed a simple experiment to study both the dynamical and statistical properties of cracking that occurs in a one-dimensional system composed of wet clay (or similar material) exposed to shrinkage ... [more ▼]

We designed a simple experiment to study both the dynamical and statistical properties of cracking that occurs in a one-dimensional system composed of wet clay (or similar material) exposed to shrinkage induced by desiccation. We study both the dynamical formation of cracks and the statistical characteristics of the final cracks pattern. We observe that the drying rate has a strong influence on the way cracks appear and grow. We find that the final crack width is related to the order of apparition of the cracks. We discuss the statistical distributions of cracks width and separation between two adjacent cracks. We also study the correlations between these two quantities. Our results are compared to the predictions of existing models. Finally, a comparison with another kind of clay is made. [less ▲]

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See detailExperimental study of granular compaction dynamics at different scales: Grain mobility, hexagonal domains, and packing fraction
Lumay, Geoffroy ULg; Vandewalle, Nicolas ULg

in Physical Review Letters (2005), 95(2), 28002

We present an original experimental study of the compaction dynamics for two-dimensional granular systems. Compaction dynamics is measured at three different scales: the macroscopic scale through the ... [more ▼]

We present an original experimental study of the compaction dynamics for two-dimensional granular systems. Compaction dynamics is measured at three different scales: the macroscopic scale through the normalized packing fraction rho, the mesoscopic scale through the normalized fraction phi of hexagonal domains in the system, and the microscopic scale through the grain mobility mu. Moreover, the hexagonal domains are found to obey a growth process dominated by the displacement of domain boundaries. A global picture of compaction dynamics relevant at each scale is proposed. [less ▲]

Detailed reference viewed: 17 (2 ULg)
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See detailExperimental study of isolated response curves in a two-degree-of-freedom nonlinear system
Detroux, Thibaut ULg; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIV (2016, January)

In the present paper, the observation and characterization of isolated response curves (IRCs) are experimentally reported in the case of a nonlinear system consisting of two masses sliding on an ... [more ▼]

In the present paper, the observation and characterization of isolated response curves (IRCs) are experimentally reported in the case of a nonlinear system consisting of two masses sliding on an horizontal guide. Transverse springs are attached to one mass to provide the nonlinear restoring force, and a harmonic motion of the complete system is imposed by prescribing the displacement of their supports. The existence of an IRC is related to a 3:1 internal resonance between the two modes of the system. The observed IRC is studied in detached and merged conditions using swept-sine excitations and system perturbations. [less ▲]

Detailed reference viewed: 39 (10 ULg)
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See detailExperimental study of journal bearings
Hanocq, Charles ULg

in Proceedings of the general discussion on lubrication & lubricants : 13th-15th October 1937. Volume 2 (1937)

Detailed reference viewed: 2 (0 ULg)
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See detailExperimental study of loss of head in a closed pipe carrying clay slurry
Hanocq, Charles ULg

in Transactions of the American Society of Mechanical Engineers (1929), 51(8), 75-78

Detailed reference viewed: 8 (0 ULg)
See detailExperimental study of phase transformations in medium-carbon steels
Mertens, Anne ULg; Brown, Andrew J.; Sietsma, Jilt

Scientific conference (2003, September 04)

Detailed reference viewed: 8 (1 ULg)
Peer Reviewed
See detailExperimental study of single loop sigma-delta and multi stage noise shaping (MASH) modulators for MEMS acceleremoter
Almutairi, B; Kraft, Michael ULg

in Proceedings of "IEEE Sensor Conference, Limerick - Novembre 2011" (2011, November)

Detailed reference viewed: 18 (1 ULg)
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See detailExperimental Study of Stall-Induced LCOs of Free Vibrating Wing
Li, Jing; Dimitriadis, Grigorios ULg

in Proceedings of the 2007 International Forum on Aeroelasticity and Structural Dynamics (2007, June)

Stall flutter is a limit cycle oscillation phenomenon occurring when all or part of the flow over a wing separates and re-attaches periodically. This paper reports on experimental investigations carried ... [more ▼]

Stall flutter is a limit cycle oscillation phenomenon occurring when all or part of the flow over a wing separates and re-attaches periodically. This paper reports on experimental investigations carried out on the subsonic stall flutter of a pitch plunge wing wind tunnel model. The object of the experiments was to investigate the aeroelastic effects of the nonlinearity introduced by boundary layer growth and flow separation and the ensuing stall-induced flutter, on a freely vibrating aeroelastic system. The motion of the wing and the pressure distribution around its surface were measured at various conditions. Three types of motion were observed, sometimes at the same wind tunnel airspeed; decay to equilibrium, symmetric limit cycle oscillations (LCO) and asymmetric LCOs. The aerodynamic mechanisms that give rise to these LCOs are described and analyzed. The effect of torsional wing stiffness on the stall flutter response of the wing is also investigated. Finally, repeating the experiments in a smaller wind tunnel showed that wind tunnel blockage has a significant effect on stall flutter. [less ▲]

Detailed reference viewed: 47 (2 ULg)